Trevor Wang’s review published on Letterboxd:
Nocturne is the newest Blumhouse supernatural horror about twin rivalry for classical music spotlight at an elite music academy.
In music, Nocturne is a composition inspired by, or evocative of, the night, and cultivated in the 19th century primarily as a character piece for piano. The name is very appropriate to this horror about a talented music student's desperation to outshine her twin sister. With the help of a mysterious notebook, Juliet indulges in a Faustian pursuit of power and stardom.
Nocturne is dark, yet realistic about the intense competitions in the music world to get to a certain level.